kubernetes build 源码
kubernetes build 代码
文件路径：/staging/src/k8s.io/code-generator/pkg/util/build.go
/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package util
import (
gobuild "go/build"
"os"
"path/filepath"
"reflect"
"strings"
"golang.org/x/tools/go/packages"
)
type empty struct{}
// CurrentPackage returns the go package of the current directory, or "" if it cannot
// be derived from the GOPATH.
func CurrentPackage() string {
for _, root := range gobuild.Default.SrcDirs() {
if pkg, ok := hasSubdir(root, "."); ok {
return pkg
}
}
return ""
}
func hasSubdir(root, dir string) (rel string, ok bool) {
// ensure a tailing separator to properly compare on word-boundaries
const sep = string(filepath.Separator)
root = filepath.Clean(root)
if !strings.HasSuffix(root, sep) {
root += sep
}
// check whether root dir starts with root
dir = filepath.Clean(dir)
if !strings.HasPrefix(dir, root) {
return "", false
}
// cut off root
return filepath.ToSlash(dir[len(root):]), true
}
// BoilerplatePath returns the path to the boilerplate file in code-generator,
// or "" if the default boilerplate.go.txt file cannot be located.
func BoilerplatePath() string {
// set up paths to check
paths := []string{
// works when run from root of $GOPATH containing k8s.io/code-generator
filepath.Join(reflect.TypeOf(empty{}).PkgPath(), "/../../hack/boilerplate.go.txt"),
// works when run from root of module vendoring k8s.io/code-generator
"vendor/k8s.io/code-generator/hack/boilerplate.go.txt",
// works when run from root of $GOPATH containing k8s.io/kubernetes
"k8s.io/kubernetes/vendor/k8s.io/code-generator/hack/boilerplate.go.txt",
}
// see if we can locate the module directory and add that to the list
config := packages.Config{Mode: packages.NeedModule}
if loadedPackages, err := packages.Load(&config, "k8s.io/code-generator/pkg/util"); err == nil {
for _, loadedPackage := range loadedPackages {
if loadedPackage.Module != nil && loadedPackage.Module.Dir != "" {
paths = append(paths, filepath.Join(loadedPackage.Module.Dir, "hack/boilerplate.go.txt"))
}
}
}
// try all paths and return the first that exists
for _, path := range paths {
if _, err := os.Stat(path); err == nil {
return path
}
}
// cannot be located, invoker will have to explicitly specify boilerplate file
return ""
}
// Vendorless trims vendor prefix from a package path to make it canonical
func Vendorless(p string) string {
if pos := strings.LastIndex(p, "/vendor/"); pos != -1 {
return p[pos+len("/vendor/"):]
}
return p
}
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